Jeffrey Baker wrote:
>
> I tried this program in Perl (outside of modperl) and the memory
> consumption is only 4.5MB:
>
> #!/usr/bin/perl -w
>
> $foo = {};
>
> for ($i = 0; $i < 14000; $i++) {
> $foo->{sprintf('%020d', $i)} = 'A'x150;
> }
>
> <>;
>
> 1;
>
> So I suggest something else might be going on causing your memory
> problems.
>
Hi Jeffrey,
good idea to boil it down.
Yes, your prog gave me only:
SIZE RSS SHARE
4696 4696 964
Running my code snippet outside mod_perl (with real data) still gives:
SIZE RSS SHARE
14932 14M 1012
A simulation like this:
#!/usr/bin/perl -w
$foo = {};
$line = "AAAA\tBBBB\tCCCC\tDDDD"; # 4 string fields (4 chars)
$line .= "\t10.99"x9; # 9 float fields (5 chars)
$line .= "\t" . 'A'x17; # 5 string fields (rest)
$line .= "\t" . 'B'x17; #
$line .= "\t" . 'C'x17; #
$line .= "\t" . 'D'x17; #
$line .= "\t" . 'E'x17; #
@record = split "\t", $line;
for ($i = 0; $i < 14000; $i++)
{
map { $_++ } @record;
$foo->{$i} = [ @record ];
print "$i\t$foo->{$i}->[0],$foo->{$i}->[5]\n" unless $i % 1000;
}
<>;
1;
prints:
0 AAAB,11.99
1000 ABMN,1011.99
2000 ACYZ,2011.99
3000 AELL,3011.99
4000 AFXX,4011.99
5000 AHKJ,5011.99
6000 AIWV,6011.99
7000 AKJH,7011.99
8000 ALVT,8011.99
9000 ANIF,9011.99
10000 AOUR,10011.99
11000 AQHD,11011.99
12000 ARTP,12011.99
13000 ATGB,13011.99
and gives:
SIZE RSS SHARE
14060 13M 1036
There is no difference between real and random data.
But I think, there is an optimization mechanism in perl concerning
strings, so you need less memory for your code.
So what is going on? 2 MB -> 14 MB ?
Still lost in space ;-))
Ernest
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